Abstract
This paper describes an experimental and observational study of iron rust removal method and iron lump formation mechanism within a heat exchanger of a small type heat pump. Since a heat exchanger of a heat pump using water is corroded, heat transfer coefficient (in other words, C.O.P.) is decreased. In this study, iron rust removal system was proposed and cleared the effectiveness. Moreover, iron lump formation mechanism was clarified by an experiment with a double pipe heat exchanger. The conclusions were as follows. 1.C.O.P. of a small type heat pump was recovered by the iron rust removal system. 2.C.O.P. decrease of a heat pump is caused by iron lump grown within a heat exchanger. The source of this iron lump is not the iron rust including water, but the iron rust produced from a heat exchanger.
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